CN109613422A - It is a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current - Google Patents
It is a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current Download PDFInfo
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- CN109613422A CN109613422A CN201811488645.9A CN201811488645A CN109613422A CN 109613422 A CN109613422 A CN 109613422A CN 201811488645 A CN201811488645 A CN 201811488645A CN 109613422 A CN109613422 A CN 109613422A
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- Prior art keywords
- breaker
- arc current
- secondary arc
- tripping
- inhibiting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Abstract
The invention discloses a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current; when special/super transmission line of electricity breaks down, protection executes phase selection program after starting, when fault type is singlephase earth fault; fault section judgement and delay are carried out, discriminates whether export tripping.If protection exit; breaker time is obtained from the intelligent control component or on-line monitoring system of breaker; it monitors non-faulting phases line voltage phase and trip signal occurs in the best time, disconnect breaker main contact when non-faulting phases line voltage 0, achieve the purpose that inhibit secondary arc current.Single-pole reclosing success rate can be improved in the mentioned method of the present invention, guarantees system safety operation, and do not need to increase additional investment.
Description
Technical field
The invention belongs to power protection system technical field, be related to it is a kind of for inhibiting the circuit breaker trip of secondary arc current when
Carve control method.
Background technique
Automatic reclosing is widely applied on transmission line of electricity.Due to can be improved power supply reliability and system operation stability,
Reclosing control overvoltage is limited, therefore generallys use single-pole reclosing on spy/extra high voltage network.Singlephase earth fault occurs,
Protection act tripping failure phase breaker, due to perfecting the electromagnetic coupling of Relative fault phase, fault point will form secondary arc (i.e.
Secondary arc current).If be overlapped failure phase breaker, secondary arc does not extinguish, will lead to reclosing failure.Reclosing failure will be to electric power
System and electrical equipment again result in impact.Inhibiting secondary arc current is the key that improve circuit re-switching success rate.
There are mainly two types of the methods for inhibiting secondary arc current on high-tension line at present: one is installing additional simultaneously on high-tension line
Join reactor and small reactor on neutral point, for compensating the capacitive coupling of transmission line of electricity, to inhibit to account for very big specific gravity in secondary arc current
Capacitive component.Second, route head and end installs high speed grounding switch (HSGS), when route breaks down, two sides open circuit
Device tripping, earthing switch closure, the secondary arc current of fault point is transferred on the earthing switch for having higher arc extinguishing ability, so that
The secondary arc current of fault point quickly extinguishes.
With the development of breaker on-line monitoring and intelligent breaker, the branch wire time of breaker can be predicted accurately.
Theoretical research and actual test show can be according to the reclosing phase by phase or sub-switching operation that the phase of current or voltage realizes breaker (i.e.
Phased breaker).Siemens, ABB AB have developed the phased circuit breaker of intelligence and have put into market.
Summary of the invention
The object of the present invention is to provide a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, can reduce
Secondary arc current after failure phase breaker tripping.
The technical scheme adopted by the invention is that a kind of for inhibiting the circuit breaker trip moment controlling party of secondary arc current
Method, when special/super transmission line of electricity breaks down, execution phase selection program after protection starting, the fault type judged is single-phase earthing event
When barrier, fault section judgement and delay are carried out, discriminates whether export tripping, if protection exit, from the intelligence control of breaker
Component or on-line monitoring system processed obtain breaker time, calculate tripping delay duration t, make non-faulting phases line voltage 0
When breaker main contact disconnect, achieve the purpose that inhibit secondary arc current.
The features of the present invention also characterized in that:
It is a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, be specifically implemented according to the following steps:
Singlephase earth fault, protection starting and phase selection occur for step 1, special/super transmission line of electricity, progress fault section judgement and
Delay, discriminates whether export tripping；
If step 2, protection exit, circuit breaker trip institute is obtained from the intelligent control component or on-line monitoring system of breaker
Take time TT, enable T1=TT；
Step 3 carries out bandpass filtering to non-faulting phases line voltage, and cutoff frequency is selected as 50~60Hz；Obtain non-faulting
The cycle T of phases line voltageN；
Step 4 compares T1WithIfIt enablesAnd step 5 is executed, ifProcess turns
To step 6；
The T that step 5, the processing of comparison step 4 obtain1WithIfIt enablesAnd step 4 is executed, ifProcess goes to step 6；
Step 6 determines non-faulting phase line using the sampled data of half period before non-faulting phases line voltage current sample values
The zero crossing t of voltage0, current sample values are calculated apart from zero crossing t0Between time TP, enable
Step 7 compares T2With the T obtained after step 4 or step 5 processing1If T2> T1, then through t=T2-T1Delay issues
Tripping pulse；If T2< T1, then pass throughDelay issues tripping pulse.
Step 1 is directed to singlephase earth fault in the area of transmission line of electricity generation, if other type faults, then presses other
Protect flow processing.
Zero crossing t0It is any one sampling instant after sampled value is become negative value from positive value or becomes positive value from negative value.
Breaker time TTRefer to from the time required for sending trip signal to breaker main contact tripping.
The tripping pulse that step 7 issues can be such that breaker main contact when non-faulting phases line voltage 0 disconnects.
The beneficial effects of the present invention are: of the invention is a kind of for inhibiting the circuit breaker trip moment controlling party of secondary arc current
Method is able to suppress secondary arc current, is conducive to the extinguishing of secondary arc current, can be improved when singlephase earth fault occurs for high-tension line
The success rate of single-pole reclosing；The present invention does not need to increase additional investment.
The present invention will inhibit secondary arc current by the tripping moment for controlling breaker.The intelligent control group of intelligent breaker
Part or on-line monitoring system pass through the mechanical property number under the operating conditions such as control voltage, operating pressure, environment temperature, gas pressure
According to, can accurately predict breaker time, for control breaker the tripping moment provide technical guarantee.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the circuit breaker trip moment control method for inhibiting secondary arc current of the present invention；
Fig. 2 is bilateral source analogue system figure in embodiment；
Fig. 3 (a) is that t1 is u in embodimentbcFor the non-faulting phases line voltage u at 0 momentbcWaveform diagram；
Fig. 3 (b) is secondary arc current waveform when t1 moment M side breaker main contact disconnects in embodiment；
Fig. 4 (a) is that t2 is u in embodimentbcThe non-faulting phases line voltage u at maximum momentbcWaveform diagram；
Fig. 4 (b) is secondary arc current waveform when t2 moment M side breaker main contact disconnects in embodiment.
Specific embodiment
A kind of method for inhibiting secondary arc current by the control tripping moment of the present invention, when special/super transmission line of electricity breaks down,
Phase selection program is executed after protection starting, when the fault type judged is singlephase earth fault, progress fault section judgement and delay,
It discriminates whether export tripping, if protection exit, obtains open circuit from the intelligent control component or on-line monitoring system of breaker
The device trip time calculates tripping delay duration t, disconnects breaker main contact when non-faulting phases line voltage 0, it is latent to reach inhibition
For the purpose of electric current.
A method of by control the failure phase circuit breaker trip moment inhibit secondary arc current, as shown in Figure 1, specifically according to
Following steps are implemented:
Singlephase earth fault, protection starting and phase selection occur for step 1, special/super transmission line of electricity, progress fault section judgement and
Delay, discriminates whether export tripping；
If step 2, protection exit, when obtaining circuit breaker trip from the intelligent control component or on-line monitoring system of breaker
Between TT, enable T1=TT；
Step 3 carries out bandpass filtering to non-faulting phases line voltage, and cutoff frequency is selected as 50~60Hz；Obtain non-faulting
The cycle T of phases line voltageN；
Step 4 compares T1WithIfIt enablesAnd step 5 is executed, ifProcess turns
To step 6；
The T that step 5, the processing of comparison step 4 obtain1WithIfIt enablesAnd step 4 is executed, ifProcess goes to step 6；
Step 6 determines non-faulting phase line using the sampled data of half period before non-faulting phases line voltage current sample values
The zero crossing t of voltage0, current sample values are calculated apart from zero crossing t0Between time TP, enable
Step 7 compares T2With the T obtained after step 4 or step 5 processing1If T2> T1, then through t=T2-T1Delay issues
Tripping pulse；If T2< T1, then pass throughDelay issues tripping pulse.
The tripping pulse that step 7 issues can be such that breaker main contact when non-faulting phases line voltage 0 disconnects.
Step 1 is directed to singlephase earth fault in the area of transmission line of electricity generation, if other type faults, then presses other
Protect flow processing.
Zero crossing t0It is any one sampling instant after sampled value is become negative value from positive value or becomes positive value from negative value.
Breaker time TTRefer to from the time required for sending trip signal to breaker main contact tripping.
The tripping pulse that step 7 issues can be such that breaker main contact when non-faulting phases line voltage 0 disconnects.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment
For a certain long 318km, voltage class is that the bilateral source transmission line of electricity of 500kV has carried out protection scheme of the present invention
Verifying, as shown in Figure 2.In Fig. 2, M side system impedance: Z1m=6.2+j17.4 Ω, Z0m=24+j15.3 Ω；The resistance of N side system
It is anti-: Z1n=26+j37.4 Ω, Z0n=47+j23.4 Ω.Line parameter circuit value are as follows: R1=0.0133326 Ω/km, L1=0.847mH/
Km, C1=0.013877 μ F/km, R0=0.032164 Ω/km, L0=2.65mH/km, C0=0.00977875 μ F/km.Route
Both ends power supply phase angle difference is 30 °.
System shown in Figure 2 is established using PSCAD/EMTDC.In 1s A phase ground fault occurs for route, and the protection of the side 1.04sN is dynamic
Make tripping failure phase breaker.After different tripping moment tripping failure phase breakers, the secondary arc current of fault point changes feelings for the side M
Shown in condition such as Fig. 3 (a), 3 (b), 4 (a), 4 (b).Fig. 3 (a) and Fig. 3 (b), Fig. 4 (a) and Fig. 4 (b) are respectively 1.064s (i.e. ubc
When being 0) and 1.069s (ubcWhen maximum) tripping when, the waveform diagram of line voltage and secondary arc current between non-faulting phase.
Compare Fig. 3 (a)-Fig. 4 (b) as it can be seen that ubcFor 0 moment tripping failure phase breaker, secondary arc current peak value is less than 2kA；
And in ubcMaximum moment tripping failure phase breaker, secondary arc current peak value reach more than 50 kA.It can be seen that failure phase breaker is jumped
The size of lock moment and secondary arc current is closely related.Obviously, in ubcBe conducive to for the main contact disconnection of 0 moment failure phase breaker
The extinguishing of secondary arc current.
Table 1 is A phase ground fault at line outlet, and the tripping of the side N failure phase breaker, the side M failure phase breaker is not
The peak value of secondary arc current when tripping in the same time.
The relationship of 1 secondary arc current peak value of table and the side M failure phase circuit breaker trip moment
Seen from table 1, secondary arc current peak value is related to the side the M circuit breaker trip moment.The 1.064s moment trips, ubcValue is in
Near 0, secondary arc current peak value is only 1.04kA；The 1.069s moment trips, ubcClose to maximum value, secondary arc current peak value reaches value
50.87kA。
In order to further verify the validity and correctness of context of methods, different faults position, transition resistance have been carried out
Emulation.Table 2 gives the dive of different faults situation for the situation of change of current peak, in table abort situation be fault point away from
The distance of the side M accounts for the percentage of total track length.Table 3 is the situation of change of secondary arc current peak value in the case of different transition resistances.
Although as can be seen from Table 2, in same increase of the tripping moment secondary arc current peak value with fault point away from M bus distance and
Reduce, but still identical as table 1 with the changing rule at tripping moment in different faults position secondary arc current peak value, i.e., in ubcIn most
The peak value of secondary arc current is minimum when small value (1.064s) tripping, in ubcThe peak of secondary arc current when in maximum value (1.069s) tripping
Value is maximum.It can be seen that it is effective in different faults position context of methods, and effect is most obvious in exit failure.
Secondary arc current peak value (kA) under 2 different faults situation of table
Secondary arc current peak value (kA) in the case of the different transition resistances of table 3
Seen from table 3, transition resistance has little effect secondary arc current peak value size, in different transition resistances
Context of methods is still effective.
By the above-mentioned means, the present invention is a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, defeated
Electric line occur singlephase earth fault when can reduce secondary arc current, be conducive to the extinguishing of secondary arc current, can be improved reclosing at
Power.PSCAD/EMTDC emulation shows: when line failure, the selected breaker optimal trip phase of selection the method for the present invention
Position can effectively reduce secondary arc current, and the determination of optimal trip phase is unrelated with abort situation, transition resistance.The present invention is mentioned
Single-pole reclosing success rate can be improved in method, improves the security and stability of system, and does not need to increase additional investment.
Claims (4)
1. a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, which is characterized in that when special/super transmission line of electricity
When breaking down, protection starting after execute phase selection program, the fault type judged be singlephase earth fault when, progress fault section
Judgement and delay, discriminate whether export tripping, the intelligent control component or on-line monitoring system if protection exit, from breaker
System obtains breaker time, calculates tripping delay duration t, disconnects breaker main contact when non-faulting phases line voltage 0,
Achieve the purpose that inhibit secondary arc current.
2. according to claim 1 a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, feature
It is, is specifically implemented according to the following steps:
Singlephase earth fault, protection starting and phase selection occur for step 1, special/super transmission line of electricity, carry out fault section judgement and prolong
When, it discriminates whether export tripping；
If step 2, protection exit, breaker time T is obtained from the intelligent control component or on-line monitoring system of breakerT,
Enable T1=TT；
Step 3 carries out bandpass filtering to non-faulting phases line voltage, and cutoff frequency is selected as 50~60Hz；Obtain non-faulting phase line
The cycle T of voltageN；
Step 4 compares T1WithIfIt enablesAnd step 5 is executed, ifProcess goes to step
6；
The T that step 5, the processing of comparison step 4 obtain1WithIfIt enablesAnd step 4 is executed, ifProcess goes to step 6；
Step 6 determines non-faulting phases line voltage using the sampled data of half period before non-faulting phases line voltage current sample values
Zero crossing t0, current sample values are calculated apart from zero crossing t0Between time TP, enable
Step 7 compares T2With the T obtained after step 4 or step 5 processing1If T2> T1, then through t=T2-T1Delay issues tripping
Pulse；If T2< T1, then pass throughDelay issues tripping pulse.
3. according to claim 2 a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, feature
It is, the zero crossing t0When being any one sampling after sampled value is become negative value from positive value or becomes positive value from negative value
It carves.
4. according to claim 2 a kind of for inhibiting the circuit breaker trip moment control method of secondary arc current, feature
It is, the breaker time TTRefer to from the time required for sending trip signal to breaker main contact tripping.
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Cited By (3)
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| CN112688422A (en) * | 2020-11-13 | 2021-04-20 | 广西电网有限责任公司电力科学研究院 | Intelligent low-voltage branch monitoring method based on cloud edge-end cooperation |
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
| CN116780639A (en) * | 2023-08-25 | 2023-09-19 | 国网浙江省电力有限公司宁波供电公司 | Distributed photovoltaic grid-connected control method, device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112688422A (en) * | 2020-11-13 | 2021-04-20 | 广西电网有限责任公司电力科学研究院 | Intelligent low-voltage branch monitoring method based on cloud edge-end cooperation |
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
| CN116780639A (en) * | 2023-08-25 | 2023-09-19 | 国网浙江省电力有限公司宁波供电公司 | Distributed photovoltaic grid-connected control method, device and storage medium |
| CN116780639B (en) * | 2023-08-25 | 2024-01-16 | 国网浙江省电力有限公司宁波供电公司 | Distributed photovoltaic grid-connected control method, device and storage medium |
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Effective date of registration: 20221216 Address after: Room 405, No. 167, Bashan West Road, Hanbin District, Ankang, Shaanxi Province, 725000 Patentee after: Wei Tao Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an Patentee before: XI'AN University OF TECHNOLOGY |